Side-bolt construction for percussive tools



L. c. BAYLES.- v SIDE BOLT CONSTRUCTION FOR PERCUSSIVE TOOLS.

' APPLICATION FILED APR-24? 1920. I v Pamnted M UNITED STATES PATENTOFFIOE.-

LEWIS C. BAYLES, OF EASTON, PENNSYLVANIA, ASSIGNOR TO INGERSOLLi ACOMPANY, OF JERSEY CITY, NEW JERSEY, A CORPORATION OF NEW JERSEY.

, SIDE-BOLT CONSTRUCTION FOR PERCUSSIVE TOOLS.

Specification of Letters Patent.

, Patented Mar. 21, 1922.

Application filed April 24, 1920. Serial No. 376,262.

T 0 (all whom it may concern Be it known that 1, Lewis C. BAYLEs, acitizen of the United States, residing at Easton, in the county ofNorthampton and State of Pennsylvania, have invented a certain new anduseful Improvement in Side- Bolt Construction for Percussive Tools, ofwhich the following is a specification.

This invention relates to fluid operated percussive tools but moreparticularly to the means usually in the form of side bolts for holdingthe parts of the drill casing together. In this type of tool, the drillcasing consists of the cylinder and the front and back end portions,which may include front and back heads. In a stope drill for instance,selected to illustrate the present invention, the drill casing includesthe cylinder portion proper and a front head, and a back end portion,all of the parts forming the casing being clamped together by suitableside bolts.

Provision is customarily made for removal of the front head asdesired'by unscrewing the nuts on the front ends of the side bolts, andin ordinary constructions the back head or back end portion, may beremoved by removing the bolts bodily. In such cases, loosening of thenuts on the bolts, loosens all the parts of the drill casing, and thefront head, or front end portion, cannot be loosened or removed withoutloosening the back head, or back end portion, which in some instances isundesirable, because dirt and muddy water may enter the tool.

The primary object of the present invention is to secure a sim 1e andefficient side bolt construction whic affords provision for loosening orremoving one or more of the end portions of the drill casing at eitherend of the tool without loosening, removing or disturbing the adjustmentand alignment of the end portion or portions of the casing at the otherend of the tool. Such a construction is highly advantageous in someinstances and permits quick adjustment or repair of the tool while atthe same time reducing or avoiding the possibilty of dirt entering thoseparts which otherwise might be loosened.

Another object of the invention is to provide for using double endedside bolts, having removable fastening devices, such as nuts, at eachend, instead of headed bolts,

and partly in vertical section showin and secure the bolts tighteningthe nuts.

Further objects will hereinafter appear and to all of these endstheinvention consists of the features of construction and combinationsof elements described and claimed in this specification and shown in theaccompanying drawings in which- Figure 1 is a side view partly brokenaway so much of a stope drill as will illustrate the invention, and

F igure 2 is a transverse sectional view on the line 22 of Figure 1looking in the dlrection of the arrows.

eferring to the drawings, A represents the main cylinder portion of thecasing of a fluid operated tool, in this instance a stope drill. In thetype of tool illustrated, actuated by fluid pressure, a piston Bconstituting a hammer, is adapted to reciprocate in the casing, theadmission of fluid to the cylinder bein controlled by a throttle valveand handle 5 and a handle D is provided for the tool, these parts beingof any suitable or usual construction. piston E' and the air feedcylinder F are indicated broken away at the back end of against turningwhile the tool and a portion of the drill steel G The air feed and aspacing piece J intermediate the main cylinder A and front head H. Atthe back end, the casing includes the feed cylinder flange K, head blockA, the back cylinder portion L and the plate 0.

The front head H and spacing piece J together form the front end portionof the tool and the feed cylinder flange K, head block A, the backcylinder portion L and plate 0 together form the back end portion of thetool. It is to be understood, however, that the cylinder casing shown inthe drawings, including the parts described, is illustrative of one formonly, and the invention is not limited to the construction described,but applies to a side bolt construction for holding the main cylindercasing and the front and back end portions together, whether either orboth of these front and back end portions comprise one or more parts.

I have chosen to show the side bolts P assing through the walls of theparts of the casing described, but I' am not to be understood aslimiting the invention to this construction, which is illustrative only.As shown in this instance the bolts P are novided with collars Qintermediate their length forming bearing portions or stops for holdingand tightly clamping portions of the casing between the collars and thetightening nuts R and R at the ends of the bolts.

' One of the portions of the casing, as the back cylinder portion L, ispreferably recessed at S to a sufficient depth determined by thethickness of the collars Q for receiving and holding the bolt collars Q,and in order to prevent the bolts from turning as they are tightened thecollars Q are preferably made eccentric to the axes of the bolts asshown, and the recesses S are eccentric to the holes in the casing forreceiving the bolts.

In assembling the parts, the'bolts are first thrust through the backcylinder portion L, the plate 0, head block A, and the feed cylinderflange K and the nuts R at the back ends of the bolts applied. The mainiylinder A, spacin piece J and front head are secured on t e bolts bythe nuts R at the front, and when the bolts are tightened, the casingmembers or portions at the back end are held between the bolt collars orstops Q and the nuts R, while the main cylinder A and remaining portionsof the casing are held between the stops Q and the nuts R at the frontend of the tool. Obviously end ortions of the casing at either end maybe oosened or removed as desired without loosening or removing oraffecting the adjustment of the parts at the otherend of the casin I caim y Y 1. A fluid actuated tool having a casing formed by a pluralityof cylinder portions fitting together and front and back end portions,double ended side bolts extending throughout the length of said portionsof the casing and entirely within the same for clamping the partstogether end to end, enlargements on each of said side boltsintermediate the length thereof engaging recesses in one of the saidcylinder portions of the casing, said enlargements being eccentric tothe axes of the bolts and said recesses being eccentric to the holes inthe casing for receiving said bolts, thus preventing rotation of thebolts, and removable tightening devices for both ends of each of thebolts, whereby the cylinder portions and end portions are in flushengagement with each other, and the part or parts of the casing betweensaid enlargement and the tightening devices at either end may beloosened or removed without disturbing any of the parts located at theopposite side of said enlargements.

2. A fluid actuated tool having a casing formed by a plurality ofcylinder portions and front and back end portions, double ended sidebolts extending throughout the length of said portions of the casing andentirely within the same for clamping the parts together end to end,rigid collars on each of saidside bolts intermediate the length thereofadapted to bear against portions of the casing, removable tighteningdevices for both ends of each of the bolts, whereby the cylinderportions and end portions are in flush engagement with each other, andthe part or parts of the casing between said collars and the tighteningdevices at either end may be loosened or removed without disturbing anyof the parts located at the opposite side of said collars, each of saidcollars being eccentric to the axes of the bolts and located withinrecesses in the cylinder portions, said recesses being eccentric to theholes in the casing for receiving said bolts to positively prevent thebolts from turning.

In testimony whereof, I have hereunto set my hand.

LEWIS o. BAYLES.

